The 525 packs a multitude of features for today’s truck and SUV owner: along with an H4 dual beam system, the 525 features PIAA’s highly effective SMR (Super Multi Surface Reflector) technology. The 525’s most unique feature is the incorporation of PIAA’s Multipurpose High Intensity LED technology that creates a glowing effect when the main bulb is switched off. You simply have to see the 525 illuminated!